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3 years ago

Find the area of a circle with radius, r = 6.87m. Give your answer rounded to 2 DP.

Mathematics

1 answer:

erastovalidia [21]3 years ago

7 0

Answer:

The answer is 148.27

Step-by-step explanation:

I dont know what rounded 2 DP means but rounded to the nearest tenth is 148.3 and rounded to the nearest whole number is 148

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Which measurement is a good estimate for the area of a circle if the diameter is 18 feet?

Rudik [331]

Answer:

If the diameter is 18 then the radius r=9 so the area is:

πr2=81π≅254.469

Step-by-step explanation:

Explanation:

The area of a circle is given by the formula πr2 where r is the radius.

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3 years ago

Which of these expressions can be used to calculate the monthly payment for

Mandarinka [93]

Answer:

1326632.865

Step-by-step explanation:

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3 years ago

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Determine if the sequence below is arithmetic or geometric and determine the

asambeis [7]

Answer:

Step-by-step explanation:

This is an arithmetic series.

3 , 5 , 7 ,......

Common difference = second term - first term

= 5 - 3

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3 years ago

If a number minus 3 is at most 12, or 1 more than 2 times the number is at least 25, then the number must be less than or equal

dezoksy [38]

Answer:

The statement is true.

Step-by-step explanation:

Let us assume that x is the required number.

Now, given that the number minus 3 is at most 12.

Hence, x - 3 ≤ 12

⇒ x ≤ 15 ......... (1)

And also given that 1 more than 2 times the number is at least 25.

Hence, 2x + 1 ≥ 25

⇒ 2x ≥ 24

⇒ x ≥ 12 .......... (2)

Therefore, from equations (1) and (2) we get the number must be greater than or equal to 12 or less than or equal to 15.

So, the statement is true. (Answer)

3 0

3 years ago

One of your friends is testing the effect of drinking coffee on the duration of cold symptoms. The common cold lasts, on average

Nonamiya [84]

Answer:

0.0930

Step-by-step explanation:

Given that one of your friends is testing the effect of drinking coffee on the duration of cold symptoms. The common cold lasts, on average, 6 days.

she tests a one-sided alternative about the population mean cold duration when drinking coffee, H0: μcoffee = 6 Ha: μcoffee < 6 She finds z = −1.68 with one-sided P-value P = 0.0465.

If hypotheses changed to two tailed as:

$H_0: \mu_{coffee} = \mu_{tea}\\H_a: \mu_{coffee}\neq \mu_{tea}$

(Two tailed test)

Since we have mean difference and std error the same, test statistic would remain the same.

p value for two tailed would be = twice the p value for one tail

= $2(0.0465)\\= 0.0930$

6 0

3 years ago